A 27-year-old man with no local address was arrested early Friday in connection with a robbery case. Police say the suspect was armed with a dangerous instrument, when he allegedly demanded the property of a 35-year-old man at about 3:44 a.m. Officers caught up with the suspect a few minutes later and he was arrested on suspicion of first-degree robbery at 4 a.m. at Piikoi and Rycroft streets.